Online test of Chapter 10 Gravitation 2 Science Class 9th
Questions:
1. The weight of a body on the earth is 120 N. The weight of the same body on the moon will be
(a) 120 N.
(b) 20 N.
(c) zero.
(d) 240 N.
2. The force acting on a ball due to the earth has a magnitude Fb and that acting on the earth due to the ball has a magnitude Fe. Then
(a) F_{b} = Fe
(b) F_{b} > Fe
(c) F_{b} < Fe
(d) F_{e} = 0
3. Two bodies A and B of masses 100 g and 200 g respectively are dropped near the earth’s surface. Let the acceleration of A and B be a_{1} and a_{2} respectively. Then:
(a) a_{1}= a_{2}
(b) a_{1 }< a_{2}
(c) a_{1} > a_{2}
(d) a_{1} ≠ a_{2}
4. The universal constant of gravitation G has the unit:
(a) N
(b) m/s^{2}
(c) (Nm^{2})/kg^{2}
(d) J
5. The acceleration due to gravity on a planet having mass twice of earth and radius thrice of earth will be, given acceleration due to gravity of earth is g.
(a)g/3
(b)2g/9
(c)4g/9
(d)2g/3
6. The body will have zero weight
(a) on the top of a mountain.
(b) on the plains.
(c) at the centre of the earth.
(d) on the sea bed.
7. The ratio of acceleration due to gravity of two objects having mass m and mass 2m on same earth surface is
(a) 2:1
(b) 1:2
(c) 1:1
(d) 1:4
8. Which of the following statement is universally true?
(a) Mass and Weight of an object is always constant.
(b) Weight is not constant, mass is constant.
(c) Mass is not constant, weight is constant
(d) Mass and weight both are not constant
9. The relative density of an object is 2.3. What is its density?
(a) 230kg/m^{3}
(b) 23Kg/m^{3}
(c) 2300kg/m^{3}
(d) 23000kg/m^{3}
10. By Archimedes principal, the Buoyant Force is equal to?
(a) Weight of Liquid displaced.
(b) Weight of object emerged in Liquid.
(c) Net force applied on object.
(d) None
Chapter 10 Gravitation Quiz 2 Class 9th
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Question 1 of 10
1. Question
The weight of a body on the earth is 120 N. The weight of the same body on the moon will be
Correct
Gravity on moon’s surface is 1/6^{th} of the Earth’s surface.
Thus, weight of 120 N on moon’s surface = 120 N/6 = 20 N
Incorrect
Gravity on moon’s surface is 1/6^{th} of the Earth’s surface.
Thus, weight of 120 N on moon’s surface = 120 N/6 = 20 N

Question 2 of 10
2. Question
The force acting on a ball due to the earth has a magnitude F_{b} and that acting on the earth due to the ball has a magnitude F_{e}. Then:
Correct
Incorrect

Question 3 of 10
3. Question
Two bodies A and B of masses 100 g and 200 g respectively are dropped near the earth’s surface. Let the acceleration of A and B be a_{1} and a_{2} respectively. Then:
Correct
Acceleration of the body doesn’t depend on the mass of the body.
Incorrect
Acceleration of the body doesn’t depend on the mass of the body.

Question 4 of 10
4. Question
The universal constant of gravitation G has the unit:
Correct
Incorrect

Question 5 of 10
5. Question
The acceleration due to gravity on a planet having mass twice of earth and radius thrice of earth will be, given acceleration due to gravity of earth is g.
Correct
( M mass of earth, R radius of earth )
Since the other planet is having Mass twice of earth 2M, radius thrice of earth 3R
Let acceleration due to gravity of the planet be
Incorrect
( M mass of earth, R radius of earth )
Since the other planet is having Mass twice of earth 2M, radius thrice of earth 3R
Let acceleration due to gravity of the planet be

Question 6 of 10
6. Question
The body will have zero weight
Correct
Incorrect

Question 7 of 10
7. Question
. The ratio of acceleration due to gravity of two objects having mass m and mass 2m on same earth surface is
Correct
The acceleration due to gravity does not depend on the mass of the object. It depends upon only mass and radius of planet at that point.
Incorrect
The acceleration due to gravity does not depend on the mass of the object. It depends upon only mass and radius of planet at that point.

Question 8 of 10
8. Question
Which of the following statement is universally true?
Correct
Mass is constant always universally as it is the quantity of matter present in matter. Weight of an object may vary from place to place as weight is the reaction force of gravitation any object apply on surface.
The weight depends upon the acceleration due to gravity present at any place.
Incorrect
Mass is constant always universally as it is the quantity of matter present in matter. Weight of an object may vary from place to place as weight is the reaction force of gravitation any object apply on surface.
The weight depends upon the acceleration due to gravity present at any place.

Question 9 of 10
9. Question
The relative density of an object is 2.3. What is its density?
Correct
Incorrect

Question 10 of 10
10. Question
By Archimedes principal, the Buoyant Force is equal to?
Correct
Incorrect